A charge is fixed at and a charge at on the -axis

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A charge

+5\,\mu\text{C}

is fixed at

x = 0

and a charge

-3\,\mu\text{C}

x = 0.30\,\text{m}

on the

x

-axis. A third charge

q

is placed at

x = 0.10\,\text{m}

. What should be the value of

q

so that the net electric potential at

x = 0.20\,\text{m}

becomes zero? (a)

+1.75\,\mu\text{C}

(b)

-1.5\,\mu\text{C}

(c)

+0.5\,\mu\text{C}

(d)

+1.0\,\mu\text{C}